Theengineer______myfatherworksisabout50yearsold.
D
with whom 引导定语从句 .with whom 放在从句中即为 :my father works with the engineer
I don ’t mind _______ the decision as long as it is not too late.
Countrylifeisbetterthancitylife________itoffersfreshairandnoiselessenvironment
Thesetwoalarmclocksarenormallysettogether,butnowtheyhavebeenresetafewhours_________.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.